Unit installation
MAC 10
®
LEDC
4x4 Fan Filter Unit
13Innovators in Clean Air Technology | www.envirco.com | Operation & Maintenance
Installation & Service Manual
■ Service: Removal and Replacement of Standard Filters
Note: All lters should be visually inspected for freight damage before installation. Since the lters are 4’ x 4’ in dimension
it is necessary to use two workers when lifting the lter, and four workers for installation to avoid twisting or separation
of the media seals. Handle the lter only by the frame and never place anything on the upstream lter side of the lter.
Additionally, it is important to keep the lter level to prevent any shearing force on the media itself.
For Standard Filters:
Tools Required: Phillips Head Driver, Battery Operated Drill
Step 1. Remove the 28 plenum housing screws. Retain for installation of new lter.
Step 2. The plenum housing must be raised up and placed out of the way to allow the lter to be turned and lowered
through the ceiling opening. Service wiring may need to be disconnected by qualied personnel.
Step 3. Before replacing with the new lter, carefully inspect the new lter for any visible damage. Also inspect the gasket
and the T-Bar to insure a tight seal. Replace if necessary.
Step 4. To replace a lter, raise the lter and rotate into position in the ceiling grid (with power off) , then lower the plenum
housing into place. Reconnect wiring and hardware from previous steps that have been removed.
Step 5. Restore power and verify proper operation of FFU.
Standard Filter Change
WARNING
DISCONNECT THE UNIT FROM THE ELECTRICAL
POWER SOURCE BEFORE ATTEMPTING
ANY SERVICE
WARNING
THE STANDARD FILTER IS PROTECTED WITH AN
EXPANDED METAL FACE SCREEN. THIS IS
NEVER TO BE USED TO HANDLE THE FILTER.
IT IS ONLY FOR PROTECTION AGAINST AN
ACCIDENTAL TOUCH OF THE FILTER.
ONLY HANDLE THE FILTER BY THE FRAME.
Screws
(28)
HEPA/ULPA
Filter
Plenum Assembly